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====Reverse incremental==== A [[Incremental backup#Reverse incremental|Reverse incremental]] backup method stores a recent archive file "mirror" of the source data and a series of differences between the "mirror" in its current state and its previous states. A reverse incremental backup method starts with a non-image full backup. After the full backup is performed, the system periodically synchronizes the full backup with the live copy, while storing the data necessary to reconstruct older versions. This can either be done using [[hard links]]βas Apple Time Machine does, or using binary [[diffs]].
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